冲压与渐进成形对SUS304不锈钢板腐蚀行为的影响  

Influence of stamping and incremental forming on corrosion behavior of SUS304 stainless steel sheets

作　　者：吴颖 张智顺[2] 温彤 WU Ying;ZHANG Zhishun;WEN Tong(School of Intelligent Manufacturing,Sichuan University of Arts and Science,Dazhou,Sichuan 635000,China;College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China)

机构地区：[1]四川文理学院智能制造学院,四川达州635000 [2]重庆大学材料科学与工程学院,重庆400044

出　　处：《石河子大学学报（自然科学版）》2021年第1期32-37,共6页Journal of Shihezi University(Natural Science)

基　　金：四川文理学院研究基地及平台专项(2019PT003Y);国家自然科学基金资助项目(51575066)。

摘　　要：为深入探讨不同板成形工艺对材料腐蚀特性的影响,本文通过有限元仿真、动电位极化曲线和电化学阻抗谱等方法并结合腐蚀形貌,分析冲压成形和渐进成形对SUS304不锈钢板在稀盐酸溶液中的表面电化学腐蚀行为的影响。结果表明:SUS304板经塑性成形后,耐均匀腐蚀性明显降低,其单位面积腐蚀失重约为原始坯料的4倍;渐进成形制件平均减薄率更大,电位负移,且腐蚀电流密度从原始坯料的70.28μA/cm^(2)增大至177.8μA/cm^(2),腐蚀反应速度加快,耐蚀性低于冲压制件,但其法兰边的耐蚀性却高于冲压制件;冲压制件的电荷转移电阻Rct、阻抗值|Z|和相位角均增大,CPE1-T减小,维钝电流密度从原始坯料的40.68μA/cm^(2)减小到28.16μA/cm^(2),弥散效应减弱,钝化膜稳定性增加,耐点蚀能力增强,综合性能更优。In order to analyze the influence of forming methods on the material properties,electrochemical corrosion behavior of SUS304 stainless steel plate formed by stamping and incremental forming in dilute hydrochloric acid were studied by means of finite element simulation,EIS,potentiodynamic polarization,et al. Results show that the corrosion resistance of SUS304 stainless steel plate decreases significantly after plastic deformation,the weight loss in per unit areas about 4 times of that of the original blank. Due to the OCP value negatively shifts and the corrosion current density increases from 70. 28 μA/cm^(2) to 177. 8 μA/cm^(2),the rate of corrosion reaction speeds up,resulting in a more severe thinning of incremental forming parts. Therefore,the corrosion resistance of deformation zone of incremental forming parts was lower than that of the stamping parts,while the other way around for the flange edge. For stamping parts,the charge transfer resistance Rct,impedance value | Z | and phase Angle of stamping parts increase,CPE1-T and diffusion effect decrease,the maintaining passivity current density decrease from 40. 68 μA/cm^(2) to 28. 16 μA/cm^(2),the stability increasement of passive film reinforced their resistance to spot corrosion. Thus the comprehensive performance of stamping parts were better.

关 键 词：腐蚀行为 冲压 渐进成形 SUS304不锈钢 电化学 

分 类 号：TG142.71[一般工业技术—材料科学与工程]